The term 'PART OF A DOOR FRAME' can be broken down into two crossword solutions: LINTEL (6 letters) and STILE (5 letters). A LINTEL is a horizontal beam that is placed over a doorway or window to support the structure above it. A STILE is a vertical piece of wood or metal that forms part of a door frame. Both lintels and stiles are important components of door frames, as they provide structural support and stability.